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11:14
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Originally posted by Nabaru01
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I'll have one more go - there is no problem with the "sulphide" circuit. The BIOX process works well with overall recoveries +80% (often closer to 90%). The issues that arose during Apex time was the insistence of the then MD to empty BIOX tanks to find the gold locked in there (which didn't exist). Taking a tank out of the circuit every few weeks caused major problems with bacteria health and there were times when the tanks actually stank of dead bacteria (and almost zero oxidisation occurred as a result = lower recoveries, more losses, more insistence gold lock up was occurring, more tanks emptied and so on). Combine this with erratic ore delivery from underground due to maintenance issues, seismic activity (rock bursts), power shortages (couldn't afford repairs on gas units) and so on - it was a nightmare. At times, we had to drop raw sulphure into the tanks to keep the bugs alive.
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The issues that arose during Apex time was the insistence of the then MD to empty BIOX tanks to find the gold locked in there (which didn't exist).
